A summary of the statistical properties of the ionosphere and troposphere. A mathematical model is developed to compute the phase errors due to the atmosphere; they are divided into random and residual bias errors. The residual bias error is the unknown component of phase error left after theoretical corrections based on measurements during satellite passage of surface index of refraction and ionospheric profile parameters. A table of certain optimum frequencies is presented for the typical and extreme conditions of altitude, integrated electron density, and integrated refractivity. 79 pp. Bibliog.
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